The battle for the best iPhone keyboard is heating up. Just a few weeks ago ThinkGeek unveiled their TK-421 iPhone 4 Case with its flip-out keyboard. But it seems that this keyboard / case concept is not all that unique. Thanko in Japan has what looks to be the same iPhone Bluetooth keyboard, but their version comes in a leather case designed to hold the iPhone and keyboard together as the same unit- kind of like the KeyFolio Case for the iPad. Either way, the more, the merrier, right? Now if they’d only some of these iPhone keyboards would be available to purchase already!